MIMAKI TS34-1800A, Maintenance Manual

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© 2011 MIMAKI ENGINEERING CO.,LTD. 5.2.1 P.1
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MAINTENANCE MANUAL > Test Items > Other Test > Determining COM short circuit
Model TS34-1800A Issued 2011.10.17 Revised F/W ver 1.20 Remark
1.0
Rev.
5.2.1 Determining COM short circuit
 Outline
Check whether the COM circuit generating part has electrical trouble or not.
 Procedure
1. Measure a resistance between the test pin TP1 to TP16 and
GND on the slider PCB ASSY to determine the COM circuit
condition. Connect the negative terminal of the tester to the
GND test pin (GND1) and measure the resistance by getting the
positive terminal touch to TP1 to 16.
Measured value of each test pin should be in the range of 17K
ohms to 18K ohms.
After turning off the sub and main power switches in order, unplug the power code.
Check if no electric charge is remaining in the PCB.
Refer to the "4.4.2 Electric charge checking when replace the Electrical Parts"
It is very dangerous if sleep mode functions mistakenly during the operation.
Moreover, the PCB may be damaged in case electric charge still remains inside.
Also there is a possibility of electric shock because of high power voltage applied the high-pressure part
of the power supply PCB assy. Take care to avoid contact with it.
TP1
6
TP1
5
TP1
4
TP1
3
TP1
2
TP1
1 TP1
0
TP9
TP8 TP7 TP6 TP5 TP4 TP3 TP2 TP1
If the machine cannot be turned on, it is highly possi-
bility of impedance anomaly of the COM circuit and
short circuit between 42V and GND in the main
PCB.
If all the measured value of the TP is shown in the
abnormal range, compare with the measured value of
the normal circuit board since it may be variation of
the tester.